Checking port heights.

[J1MS]

Steel rules are the normal for checking port heights in the bore as not much else that's cheap and easy to use fits inside the barrel.

I use a modified Vernier gauge (these are available from £7) with the external calipers ground off, this makes the ports inside the barrel very accessible.

This is the Inlet port height measured with my modified vernier caliper.



This picture shows my ground down caliper. Mine need to be re-calibrated by eye each time they are used, as I have removed the maximum amount of metal from the external part of the caliper. If I had left a small portion then it would be easier to zero the reading prior to using them. but access is better on small components as they are...

I think this makes it easier to get a good reading compared to using a steel ruler, and measuring transfers in the bore is far more accurate, IMO.

This is the gauge being use to measure an exhaust port on the same barrel.

[dirtyhandslopez]

Splendid idea. Always been a bugger to get a true exhaust port reading at the bore and using your finger for a stopper never really felt right.
Now, what is this port timing stuff all about again?